Althoughthecausesofcancerwedon

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Although the causes of cancer ____we do not yet have any practical way to prevent it.

A．are being uncovered	B．have been uncovering
C．are uncovering	D．have uncovered

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Go and see that play. I______ you'll enjoy it.

A．guarantee

B．complaint

C．budget

D．feel

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He must have attended the meeting yesterday, ___he?

A．didn’t

B．mustn’t

C．needn’t

D．hadn’t

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So absorbed _____ in her work that she didn’t realize I was behind her.

A．did she

B．was she

C．she did

D．she was

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He is very ___________ his ugly appearance.

A．curious about

B．care about

C．sensitive to

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With more forests being destroyed, huge quantities of good earth ______ each year.

A．is washing away	B．is being washed away
C．are washing away	D．are being washed away

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